Cylinder and piston arrangement for internal-combustion engines



y 1950 D. VALBUENA CASADO 2,514,016

CYLINDER AND PISTON ARRANGEMENT FOR INTERNAL-COMBUSTION ENGINES 2 Sheets-Sheet 1 Filed 001:. 29, 1945 INVENTOR Omwa VHLBI/E/Vl 64x00 gym-flaw A7701? EKS July 4, 1950 D. VAL'BUENA cAs A00 CYLINDER AND PISTON ARRANGEMENT FOR INTERNAL- COMBUSTION ENGINES Filed Oct. 29, 1945 2 Sheets-Sheet 2 ,1 DAN/EL M wuav/a Una/r00 By g, a

A T TO/PNE K5 Patented July 4, 1950 CYLINDER AND PISTON ARRANGEMENT Foe INTERNAL-COMBUSTION ENGINES Daniel Valbuena Casado, Valladolid, Spain- Application October 29, 1945, Serial No. 625,397

In Spain February 16, 1945 I This invention relates to cylinders and pistons and more particularly to the lubrication of cylinders and pistons in an internal combustion engine.

An object of this invention is the provision of such a cylinder and piston wherein excess lubricant is returned to the pan or lubricant reservoir.

Another object is the provision of such a cylinder and piston wherein excess lubricant is not passed into the, explosion chamber of an internal combustion engine but is returned to the reservoir even though the tight fit of the piston in the cylinder may be lost through normal wear.

Other objects and novel features will appear as the nature of the invention is better understood, the invention consisting in the novel arrangement and co-relation of parts herein fully described, and illustrated in the accompanying drawings, wherein similar reference characters are used to denote corresponding parts throughout the several views, and then finally pointed out and specifically defined and indicated in the appended claims.

The disclosure made the basis of exemplifying the present inventive concept suggests a practical embodiment thereof but the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to be understood from an illustrative, rather than a restrictive standpoint.

In carrying out a preferred embodiment of the invention, it was found desirable to provide a guide ring, with conical end surfaces, connected to the cylinder and in which the piston moves, said guide ring having passageways formed therein through which excess lubricant may flow back to the engine pan.

In the drawings:

Figure 1 is a longitudinal section through the cylinder and guide ring showing the piston in perspective therein.

Figure 2 is a longitudinal section through the cylinder, piston, and guide ring.

Figure 3 is a sectional View along the line aa of Figure 1.

Figure 4 is a bottom end view of the device shown in Figure 1.

Referring to the drawings in detail, a guide ring '1 is connected to cylinder l by screws 6. The piston 2 is longitudinally moveable in the interior bore of guide ring I and cylinder l. The diameter of the interior bore of guide ring I is smaller than the interior bore of cylinder I. The guide rin 1 has an end 8 which is conical and formed with a circular groove A. A plurality of holes B lead from circular groove A to annular 2 Claims. (01. 123-193) chamber C formed .by

cylinder I and guide I. Passageways D, formed in guide ring 7 constitute continuations of annular chamber C and lead to the pan of an engine not shown herein.

Piston 2 has a body portion smaller in diameter than the head; the body portion being adapted to fit the interior bore of guide ring I and the piston head being adapted to fit the interior bore of cylinder l. Piston 2 is connected to rod 4 by pin 3. The head of piston 2 is further adapted with circular grooves in which piston rings 5 may be placed. Four oblong drill holes E out in the body portion of piston 2 also connect the interior bore of cylinder I to the pan or oil reservoir of the engine. These holes E are separated by in the surface of the piston 2.

In operation, in an engine utilizing the crankshaft spray method of lubrication, oil splashed by the crankshaft of an engine, not shown herein, lubricates the surface 9 of piston 2.

Excess oil is picked up by groove A, from surface 9 of piston 2 and then passes through holes B to annular chamber C and passageways D into the pan or oil reservoir of an engine.

The compression and decompression in circular chamber l0 formed between the body of piston 2 and the interior bore of cylinder 1 is communicated to the pan of the engine through holes E. At the same time piston rings 5 receive very tiny particles of lubricating oil, mixed with hot air through holes E from the pan of the engine.

From the foregoing it will be seen that the present invention provides a very simple yet highly useful means of insuring the return of excess lubricant deposited on a piston to the pan or oil reservoir of an engine. It further insures against the excess oil passing into the combustion chamber of the engine.

It is apparent that the illustrations shown above have been given solely by way of illustra tion and not by way of limitation and that the above examples are subject to wide variations and modifications within the scope of the present invention. All such variations and modifications are to be included within the scope of the present invention.

What is claimed is:

l. Improvements in internal combustion engines comprising a cylinder, a guide ring connected to said cylinder, a piston movable in said cylinder and said guide ring, said guide ring having an inner end in said cylinder, a transverse groove in said inner end, said guide ring and said cylinder forming an annular chamber, said guide ring having a plurality of holes formed therein connecting said transverse groove and said annular chamber, and said guide ring having a plurality of passageways formed therein and connecting said annular chamber to the pan of said engine, whereby lubricant is picked up from the surface of said piston and returned to the pan of said engine.

2. Improvements in internal :combustion 'eengines comprising a cylinderya guide -ring-"connected to said cylinder, a piston movable in said cylinder and said guide ring, said cylinder having a cylinder bore formed therein-:andzisaid gguide ring having a guide ring borepformed therein, said piston having a head portion and a body portion, said head portion forming --a'-bearing surface movable in said cylinder-bore, said bedy portion forming a bearing surface movable ,in said guide ring bore,rsaid body portion having four holes formed therein whereby said cylindenbore is connected to the pan of said engine, said guide ring having an inner endin said cylinder; a

transverse gIOOVevin .asaid inner end, said :guide -iup,,fr0m the surface of; said piston and returned "to'the'pan'of said engine.

DANIEL V. CASADO.

REFERENCES CITED #Theiollowing references are of record in the sfileeof ,this patent:

UNITED STATES PATENTS Number Name Date 364,627 Arnold June 14, 1887 670,803 McMahon Mar. 26, 1901 920,165 Marcil May 4, 1909 945333 TI-Iatch 'Jan'. 4,"'1910 

